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Gecko Side (v2)
CustomDUO Side modules have been designed to fit with the CustomDUO Gecko Spot modules. The Gecko Side module provides a broad forward directional flood output, and 4 useful power settings (block of 3 standard + moon-milk!). Now with innovative battery level 'fuel' gauge, featuring through optic red indicator LEDs, visible on hand held in front of lamp, without removing helmet. 
An ideal upgrade for cavers, providing the soft all round illumination, desirable for negotiating cave passage. Significantly brighter than the standard Duo 14 LED array at the same 350mA power setting, and providing much improved light quality! 
£32 (discontinued, v3 available soon)
















4 regulated power settings in a simple block of 3, plus 1 additional (Moon-milk !). 


Latest high power Cree XP-G2 5500k s3 LED or 3000k r4 warm. 

Low (100mA, 45 lumen), Medium (350mA, 150+ lumen) and High (700mA, 285 lumen) ..5500k LED. This equates to approx. 25 hours, 7 hours and 3.5 hours using a set of 2500 mAh AA nimh batteries.


Moon-milk Mode (very low, 10mA, 4 lumen), separate to main sequence. Accessed via swift double operation of switch.  


Battery 'fuel' gauge Through optic red LEDs blink 1-5 times to indicate battery charge. Visible on hand held in front of lamp. Suitable for NiMh or Alkaline cells. Activated in conjunction with Moon-milk Mode (see chart).


Broad forward directional flood optic and custom heat-sink


3 second last mode memory. Lamp reverts to last used setting at next switch operation. A solder jumper is available on PCB to enable an alternative protocol - 3 second memory, restart at mode 1 (low flood).   


Progressive dimming at end of battery charge, i.e. lamp will not just shut off when batteries are flat and cannot sustain full output.


Fitted by a simple 2 pin push fit, directly into existing Duo pilot bulb connections.


Gecko Side modules provide significantly more light output, and improved light quality (distribution and colour), being less focused than standard 14 LED Petzl Modu'led units. The Gecko Side modules will provide around 150 lumens at 350mA. The Petzl Modu'led 14 (producing a distinctly 'blue' light) is rated at 67 lumens at around 350mA. 


No power drain when lamp is 'switched off' with batteries connected.


6.0 volt maximum input.






We get a lot of questions about the polarity of some early pre 2004 Duos. Please note that CustomDUO Modules work with all Petzl Duos. For more information on this please see the Module Fitting Guide 


Note - fitting information for Gecko v2 Side module not yet updated, but procedure similar and intuitive.



The Online Shop allows payment with most debit and credit cards, without the requirement for a Paypal account. Add product to cart and option is offered at checkout. Customduo also accept UK cheque or bank transfer.   


International orders welcome. We are currently shipping internationally (outside UK) at no extra postal charge.  For more details please see International Delivery